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Note 6 - Other Comprehensive Income (Details) - The Before and After Tax Amounts for Each Component of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Securities available for sale:        
Unrealized holding gains on securities available for sale arising during the period $ (1,944) $ (609) $ (400) $ 4,230
Unrealized holding gains on securities available for sale arising during the period 865 271 178 (1,883)
Unrealized holding gains on securities available for sale arising during the period (1,079) (338) (222) 2,347
Reclassification adjustment for securities gains included in net income (213) (329) (345) (1,208)
Reclassification adjustment for securities gains included in net income 95 146 154 537
Reclassification adjustment for securities gains included in net income (118) (183) (191) (671)
Total securities available for sale (2,157) (938) (745) 3,022
Total securities available for sale 960 417 332 (1,346)
Total securities available for sale (1,197) (521) (413) 1,676
Retirement plans and post-retirement life insurance:        
Reclassification adjustment for amortization of prior service cost   10 10 20
Reclassification adjustment for amortization of prior service cost   (3) (5) (8)
Reclassification adjustment for amortization of prior service cost   7 5 12
Reclassification adjustment for amortization of net actuarial losses 1,580 1,017 2,603 1,833
Reclassification adjustment for amortization of net actuarial losses (703) (453) (1,158) (816)
Reclassification adjustment for amortization of net actuarial losses 877 564 1,445 1,017
Total retirement plans and post-retirement life insurance 1,580 1,027 2,613 1,853
Total retirement plans and post-retirement life insurance (703) (456) (1,163) (824)
Total retirement plans and post-retirement life insurance 877 571 1,450 1,029
Total other comprehensive income (577) 89 1,868 4,875
Total other comprehensive income 257 (39) (831) (2,170)
Total other comprehensive income $ (320) $ 50 $ 1,037 $ 2,705